Expansible packing for plungers



Jan. 12,1926. 1,569,560

E. E. MILLER EXPANSIBLE PACKING FOR PLUNGERS Filed June 23, 1925 2Sheets-Sheet 1 Jan. 12 Q 1926. 1,569,560

' E. E. MILLER EXPANSIBLE PACKING FOR PLUNGERS Filed June 23, 1925 2Shets-Sheet z 53/ Z- Patented Jan. 12, 1926.

ERWIN E. MILLER, FULLERTON, CALIFORNIA.

EXPANSIBLE PACKING FOR PLUNGERS.

Application filed June 23, 1925. Serial No. 39,058.

7 '0 all whom it may concem:

Be it known that I, Enwn; E. MILLER, a

citizen of the United States, residing at Fullerton, in the county ofOrange and State of California, have invented new and usefulImprovements in Expansible Pack ings for Plungers, of which thefollowing is a specification.

This invention relates to improvements in plungers for pumps and thelike.

An important object of the invention is to provide a plunger having anexpansible packing, and to provide a spacing or centering part whichwill keep the packing in concentric relation about the plunger rod.

Other objects of the invention are to provide a plunger in which theleakage between .the heads is'eflectivley prevented and in which fluidpressure which expands the packing is applied beneath the end portionsof the packing so that the end portions of the packing will be properlyexpanded to take up wear at the portions of the packing, where wear isthe greatest.

A further object of the invention is to provide an improved plunger headwhich is used in the embodiment of the improved construction.

With the foregoing and other objects in View which will be made manifestin the following detailed description and s cifiings for an illustrativeembodiment of the invention, wherein:

Figure 1 is a vertical section through a pump barrel or cylinder andthrough the improved form of plunger disposed therein,

Fig. 2 is a side elevation o .the plunger,

Fig. 3 is an end elevation of the plunger,

Fig. 4 is a vertical section taken nthe line 44 of Fig. 2,

Fig. 5 is a" vertical section through the pump barrel and plungershowing a modified constructilililnil sh Fig. 6 is a s' ar view to Fig.5, owm g a still further modified form of construction,

Fig. 7 is a vertical section through Fig. 5 taken upon the line 7-7, and

Fig. 8 is a vertical sectiontaken on the line 8-8 of Fig. 6.

Referring to the accompanying drawings wherein similar referencecharacters designate similar parts throughout, the plunger rod isindicated at 10 and is shown as provided with a tapered portion 11 and acylinheads 13 and drical threaded portion 12. On the plunger rod thereare mounted Which are maintained on the rod as by a nut 15 and a locknut 16. The heads 13- and 14 have projecting hubs 17 and-18, which abuteach other.

shoulders 19 and 20 respectively, and grooves 21 and 22 are formed inthe faces of the heads about the hubs 17 and 18 within the annularshoulders 19 and 20. Ports 23 are formed longitudinally through theheads 13. and 14 and terminate upon the shoulders 19 and 20.

27 which has outwardly extending flanges within the grooves 21 and 22.As clearly shown in Fig. 1, the in- 28 which are disposed wardlyextending flanges 26 on the expans1ble pack1ng 24 overlap the outwardlyextending flanges 28 on the sealing ring 27. As both the sealing ring 27and the packing 24 are formed of soft, flexible material, this overlapforms a tight seal against leakage from the'chamber 29 between theabutting hubs 17 and 18. As the piston reciprocates,

On the opposed faces of the" 14 there are formed annular T OFF-ICE.

twoheads 13 and 14, v o

fluid pressure enters-the apertures 23 and escapes into the chamber 29past the flanges 26, thus expanding the packing 24. When the chamber 29is substantially filled with fluid, the fluid pressure within theapertures 23 is applied beneath the end portions 25 of the expansiblepacking 24, and as these end portions have their outer edges wornconsiderably, the pressure so applied keeps the end portions expanded totake up wear.

The pumps for which the improved plunger-s are primarily designedusually have their barrels or cylinders arranged in horizontal position,so that the plunger reciprocates horizontally. Because of the weight onthe packing 24, it tends to bear against the bottom surface of thecylinder and the pacln'ng will consequently wear the most on its lowersurface.

In the modification shown in Fig. 5,

means is provided for maintaining the pack ing 24 concentrically aboutthe plunger rod 10 so that wear will be equally distributed ,over theperipheral surface of the packing.

This means consists of a spacing or centering part 30 formed integralwith the sealing ring 27. It is in the form of a projecting centralflange which is engageable upon the interior surface of the expansiblepacking 24 at approximately its center. This flange divides the chamber29 into two compartments 29 and 29 and is provided with notches orrecesses 31 upon its peripheral surface, permitting flow or establishingcommunication between the compartments 29 and 29 so-that fluid canreadily flow from one compartment to another. The flange 30 maintainsthe expansible packing 24 in concentric relation about the plunger rodand cooperates with the shoulders 19 and 20 in keeping it is suchposition.

In Fig. 6 a further modified form of plunger is provided, in which thecentering part is indicated at 32 which is formed in- Y tegral with thepacking 24, constituting an inwardly extending. central flange which isdisposed centrally between the flanges 26 on the packing 2,4. Thiscentral flange has its interior surface engageable upon the center ofthe sealing ring 27, and has notches 33 formed on its inner surface,which permits the fluid to readily pass from one compartment to theother defined in the chamber 29 by the flange.

From the above it will be appreciated that an improved form of plungeris provided in which the expansible packing is maintained in concentricrelation about the plunger rod, and the packing has flange portionsengaging and overlapping flange portions on the sealing ring toeffectively prevent any leakage between the heads.

It will be understood that various changes may, be made in the detail ofconstruction without departing from the spirit or scope I of theinvention as defined by the appendec claims.

I claim: 1. A plunger for pumps and the like comprising a plunger vrod,means providing heads upon the rods, a sealing ring dlsposed between theheads having outwardly extending flanges, an expansible packing disposedbetween the heads having inwardly extending flanges engaging the flangeson the sealing ring, and means providing passages throu h the headsopposite one of said sets 0 flanges for thepurpose described.

2. A plunger for pumps and the like comprising a plunger rod, meansproviding heads upon the plunger rod, a sealing ring disposed betweenthe heads having outwardly extending flanges, an expansible ackindisposed between the heads having inwar ly extending flanges overlappingthe flanges on the sealing ring, and means providing passages throughthe heads opposite the flanges on the packing as and for the purposedescribed.

3. A plunger for pumps and the like comprising a plunger rod, meansproviding heads upon the plunger rod having shoulders formed on theiropposed faces, a sealing ring having outwardly extending flangesdisposed between the heads, an expansible packing having end portionsengageable upon the shoulders and inwardly extending flanges overlappingthe flanges on the sealing ring, and means for admitting fluid pressureto the space between the, packing and the sealing ring to expand thepacking. 4. A plunger for pumps and the like comprising a plunger rod,means providing headsupon the plunger rod having shoulders formed ontheir opposed faces, a sealing ring having outwardly extending flangesdisposed between the heads, an expansible packing having end portionsengageable upon the shoulders and inwardly extending flanges overlappingthe flanges on the sealing ring, and means providing passages throughthe heads terminating upon the shoulders as and for the purposedescribed.

5. A plunger for pumps and the like com prising a plunger rod, meansproviding heads upon the plunger rod, an expansible packing disposedbetween the heads, a spacrod, said spacing orcentering part beingarranged centrally of the packing upon the inside thereof, and means foradmitting fluid pressure to the space between the heads 11 to expand thepacking.

7. Aplunger for pumps and the like com-r prising a plunger rod, meansproviding heads upon the plunger rod, an expansible packing disposedbetween the heads, a spacing or centering part for maintaining thepacking in concentric relation to the plunger rod, said spacing orcentering part being arranged centrally of the'packing and havingpassages 'therethrough, and means for admitting fluid pressure betweenthe. heads upon either side of the centering part,

8. A plunger for pumps and the like comprising a plunger rod, meansproviding heads upon the plunger rod, an expansible mitting fluidpressure to the space between the heads and packing to expand thepacking, and a spacing or centering part for maintaining the packinginconcentric relation about the plunger rod, said spacing or centerinpart having passages there- 1 through an being arranged centrally of thepacking.

10. A pump plunger comprising a plunger rod, means provi a pair of headsupon the plunger rod having annular grooves 'upon their opposed faces,an expansible' packing disposed between the heads having inwardlyextending flanges, a sealing ring disposed between the heads havingoutwardly extending flanges,fone of said sets of flanges being disposedwithin said grooves and being overlapped by the other set, and means foradmitting" fluid pressure between the sealing ring and packing to expandthe packing.

11. A pump plunger compri a plunger rod, means providing a pair of eadsupon the plunger rod having annular grooves upon their opposed faces, anexpansible packing disposed between the heads having inwardly extendingflanges, a sealing admitting ring disposed between the heads havingoutwardly extending flanges disposed within said grooves and beingoverlapped by the flanges on the sealing ring, and means for admittingfluid pressure to the space between the packing and seali ring.

12. A head for plungers an the like comprising a head having a hubprojecting from one face thereof, a groove formed in the face about thehub, an annular shoulder formed on the face about the groove, andpassages formed in the head terminating in grooves upon the shoulder.

13. A plunger for pumps and the like comprising a plunger rod, meansproviding two heads upon the plunger rod, an expansible packing arrangedbetween the heads,

a sealing ring disposed between the heads,

a spacing or centering part disposed between the sealin ring and thepacking forkeeping the pac g in concentric relation about the plungerrod, and means for admitting fluid pressure between the packing andsealing ring. I

14. A plunger for pumps and the like comprising a plunger rod, two headsmounted upon the plunger rod, means for keeping the heads properlysipaced thereon, an expansible packing ringtting between the heads, aspacing or centering part arrangedbetween the ring and said means forkeeping the packing ring in'concentric relation about the plunger rod,and means for fluid pressure between the heads to the spaceon both sidesof the centering part to expand the packing ring.

In testimony whereo name to this specification.

ERWIN- a. MILLER

